/* Exercise 5.47
   ejer5_47.c */
#include <stdio.h>
#include <stdlib.h>
#include <time.h> /* contains prototype for function time */

/* enumeration constants represent game status */
enum Status { CONTINUE, WON, LOST };

int rollDice( void ); /* function prototype */
enum Status playGame(void);

/* function main begins program execution */
int main( void )
{
    float bankBalance = 1000;
    float wager;
    enum Status result;
    int message;

    /* randomize random number generator using current time */
    srand( time( NULL ) );

    while(bankBalance > 0.0f)
    {
        printf("Your current balance is $%0.2f, Enter your wager: ", bankBalance);
        scanf("%f", &wager);

        if(wager > bankBalance || wager < 0.0f)
        {
            printf("Invalid wager, Your current balance is $%0.2f, Enter your wager: ", bankBalance);
            scanf("%f", &wager);
        }

        result = playGame();

        message = rand() % 3;

        switch(message)
        {
        case 0:
            printf("Oh, you're going for broke, huh?\n");
            break;
        case 1:
            printf("Aw cmon, take a chance!\n");
            break;
        case 2:
            printf("You're up big. Now's the time to cash in your chips!\n");
            break;
        }

        if (result == WON)
            bankBalance += wager;
        else
            bankBalance -= wager;
    }

    printf("Sorry, You busted\n");

    return 0; /* indicates successful termination */
} /* end main */

/* roll dice, calculate sum and display results */
int rollDice( void )
{
    int die1; /* first die */
    int die2; /* second die */
    int workSum; /* sum of dice */

    die1 = 1 + ( rand() % 6 ); /* pick random die1 value */
    die2 = 1 + ( rand() % 6 ); /* pick random die2 value */
    workSum = die1 + die2; /* sum die1 and die2 */

    /* display results of this roll */
    printf( "Player rolled %d + %d = %d\n", die1, die2, workSum );
    return workSum; /* return sum of dice */
} /* end function rollRice */

enum Status playGame(void)
{
    int sum; /* sum of rolled dice */
    int myPoint; /* point earned */

    enum Status gameStatus; /* can contain CONTINUE, WON, or LOST */

    sum = rollDice(); /* first roll of the dice */

    /* determine game status based on sum of dice */
    switch( sum )
    {
        /* win on first roll */
    case 7:
    case 11:
        gameStatus = WON;
        break;

        /* lose on first roll */
    case 2:
    case 3:
    case 12:
        gameStatus = LOST;
        break;

        /* remember point */
    default:
        gameStatus = CONTINUE;
        myPoint = sum;
        printf( "Point is %d\n", myPoint );
        break; /* optional */
    } /* end switch */

    /* while game not complete */
    while ( gameStatus == CONTINUE )
    {
        sum = rollDice(); /* roll dice again */

        /* determine game status */
        if ( sum == myPoint )   /* win by making point */
        {
            gameStatus = WON; /* game over, player won */
        } /* end if */
        else
        {
            if ( sum == 7 )   /* lose by rolling 7 */
            {
                gameStatus = LOST; /* game over, player lost */
            } /* end if */
        } /* end else */
    } /* end while */

    /* display won or lost message */
    if ( gameStatus == WON )   /* did player win? */
    {
        printf( "Player wins\n" );
    } /* end if */
    else   /* player lost */
    {
        printf( "Player loses\n" );
    } /* end else */

    return gameStatus;
}
